Perma-Coil® Inserts and Repair Kits
Perma-Coil helically coiled inserts are made from 304 (18-8) stainless steel that has been rolled to a carefully controlled diamond shape thread form. Designed to be slightly oversized in diameter, when installed into a STI (Screw Thread Insert) tapped hole, the insert expands outward with a spring-like action that securely grips the wall of the parent material providing a much stronger, permanent thread.
Perma-Coil inserts and repair kits are designed to repair stripped threads in a variety of metals including aluminum, aluminum alloys, magnesium, cast iron and bronze. If the original threads can be stripped, there is a Perma-Coil insert to repair it. Perma-Coil repair kits are available in the following standard thread sizes: Inch Coarse (4-40 thru 1 ½), Inch Fine (10-32 thru 1 ½), Metric Coarse (M3 thru M20), Metric Fine (M8 thru M16), Spark Plug (10mm, 12mm, 14mm & 18mm) and Pipe Thread (1/8” thru 1”).